1// -*- C++ -*- 2 3// Copyright (C) 2005, 2006 Free Software Foundation, Inc. 4// 5// This file is part of the GNU ISO C++ Library. This library is free 6// software; you can redistribute it and/or modify it under the terms 7// of the GNU General Public License as published by the Free Software 8// Foundation; either version 2, or (at your option) any later 9// version. 10 11// This library is distributed in the hope that it will be useful, but 12// WITHOUT ANY WARRANTY; without even the implied warranty of 13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14// General Public License for more details. 15 16// You should have received a copy of the GNU General Public License 17// along with this library; see the file COPYING. If not, write to 18// the Free Software Foundation, 59 Temple Place - Suite 330, Boston, 19// MA 02111-1307, USA. 20 21// As a special exception, you may use this file as part of a free 22// software library without restriction. Specifically, if other files 23// instantiate templates or use macros or inline functions from this 24// file, or you compile this file and link it with other files to 25// produce an executable, this file does not by itself cause the 26// resulting executable to be covered by the GNU General Public 27// License. This exception does not however invalidate any other 28// reasons why the executable file might be covered by the GNU General 29// Public License. 30 31// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. 32 33// Permission to use, copy, modify, sell, and distribute this software 34// is hereby granted without fee, provided that the above copyright 35// notice appears in all copies, and that both that copyright notice 36// and this permission notice appear in supporting documentation. None 37// of the above authors, nor IBM Haifa Research Laboratories, make any 38// representation about the suitability of this software for any 39// purpose. It is provided "as is" without express or implied 40// warranty. 41 42/** 43 * @file node_metadata_selector.hpp 44 * Contains an implementation class for tries. 45 */ 46 47#ifndef PB_DS_TRIE_NODE_METADATA_SELECTOR_HPP 48#define PB_DS_TRIE_NODE_METADATA_SELECTOR_HPP 49 50#include <ext/pb_ds/detail/basic_tree_policy/null_node_metadata.hpp> 51#include <ext/pb_ds/detail/types_traits.hpp> 52 53namespace pb_ds 54{ 55 namespace detail 56 { 57 58 template<typename Node_Update, bool Null> 59 struct trie_metadata_helper 60 { 61 typedef typename Node_Update::metadata_type type; 62 }; 63 64 template<typename Node_Update> 65 struct trie_metadata_helper< 66 Node_Update, 67 true> 68 { 69 typedef null_node_metadata type; 70 }; 71 72 template<typename Key, 73 typename Data, 74 class Cmp_Fn, 75 template<typename Const_Node_Iterator, 76 class Const_Iterator, 77 class Cmp_Fn_, 78 class Allocator_> 79 class Node_Update, 80 class Allocator> 81 struct trie_node_metadata_selector 82 { 83 private: 84 typedef 85 dumconst_node_iterator< 86 Key, 87 Data, 88 Allocator> 89 dumconst_node_it; 90 91 enum 92 { 93 null_update = 94 is_same< 95 Node_Update< 96 dumconst_node_it, 97 dumconst_node_it, 98 Cmp_Fn, 99 Allocator>, 100 null_trie_node_update< 101 dumconst_node_it, 102 dumconst_node_it, 103 Cmp_Fn, 104 Allocator> >::value 105 }; 106 107 public: 108 typedef 109 typename trie_metadata_helper< 110 Node_Update< 111 dumconst_node_it, 112 dumconst_node_it, 113 Cmp_Fn, 114 Allocator>, 115 null_update>::type 116 type; 117 }; 118 119 } // namespace detail 120} // namespace pb_ds 121 122#endif // #ifndef PB_DS_TRIE_NODE_METADATA_SELECTOR_HPP 123